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Note 14 - Restructuring Costs - Summary of Restructuring Costs for the Period (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring and related costs |  | $ 697 |  | $ 1,353
Severance and Other Termination Benefits [Member] |  |  |  |
Restructuring and related costs |  | 526 |  | 691
Lease Obligation Restructuring [Member] |  |  |  |
Restructuring and related costs |  |  |  | 213
Restructuring Impairment of Fixed Assets and Accelerated Depreciation [Member] |  |  |  |
Restructuring and related costs |  | 80 |  | 353
Other Restructuring [Member] |  |  |  |
Restructuring and related costs |  | $ 91 |  | $ 96

X
- Definition Discloses the amount of restructuring cost or gain incurred during the period. + References No definition available. + Details
Name: | lyts_RestructuringAndRelatedCostIncurredCostGain
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=lyts_SeveranceAndOtherTerminationBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=lyts_LeaseObligationRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=lyts_RestructuringImpairmentOfFixedAssetsAndAcceleratedDepreciationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |